update zh-cn/application-dev/database/database-mdds-guidelines.md.

Signed-off-by: N葛亚芳 <geyafang@huawei.com>

zh-cn/application-dev/database/database-mdds-guidelines.md

@@ -105,7 +105,7 @@
    // Stage模型获取context
    import UIAbility from '@ohos.app.ability.UIAbility';
    let context = null;
-   class EntryAbility extends UIAbility{
+   class EntryAbility extends UIAbility {
       onWindowStageCreate(windowStage){
         context = this.context;
       }